Fail2ban Postfix SASL configuration

-

The basic configuration file of Fail2ban is available at /etc/fail2ban/local.conf. However, to make customization we need to use a local config file called /etc/fail2ban/jail.local

To configure Fail2ban for Postfix SASL, add the following section in the jail.local file.

[sasl]
enabled  = true
port     = smtp
filter   = postfix-sasl
logpath  = /var/log/mail.log
maxretry = 5

 Additionally, we need to configure Fail2Ban filter for postfix authentication failures in /etc/fail2ban/filter.d/postfix-sasl.conf.

A working postfix-sasl.conf contains the following details:

# Fail2Ban filter for postfix authentication failures
[INCLUDES]
before = common.conf
[Definition]
_daemon = postfix/smtpd
failregex = ^%(__prefix_line)swarning: [-._\w]+\[<HOST>\]: SASL (?:LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed(: [ A-Za-z0-9+/]*={0,2})?\s*$

Ref:
https://bobcares.com/blog/fail2ban-postfix-sasl/

Comments

Post a Comment

Popular posts from this blog

Disabling Zimbra's AntiSpam, Amavis and AntiVirus filtering

-
 Check whether antispam and antivirus service is enabled currently on server using the given command zmprov -l gs <mail.example.com> | egrep -i 'serviceen|servicein'  The above command will list all the services which are currently installed and enabled on the server. Disable the antivirus and antispam services using the given commands zmprov -l ms <mail.example.com> -zimbraServiceEnabled antispam  zmprov -l ms <mail.example.com> -zimbraServiceEnabled amavis zmprov -l ms <mail.example.com> -zimbraServiceEnabled antivirus  Comment the following line in the file /opt/zimbra/postfix/conf/main.cf content_filter = smtp-amavis:[127.0.0.1]:10024  Restart services on server zmcontrol restart  Confirm that the antispam and antivirus services are disabled with the given command zmprov -l gs <mail.example.com> | egrep -i 'serviceen|servicein'  zmcontrol status 
Read more

Cambium cnPilot E400/E410/E500 Configuration Tutorial

-
Image
Basic Connectivity:   Router (Broadband/mikrotik |dhcp enabled) >>> E400/E410/E500 + LAPTOP Cambium (Powered ON) [POE port] >>>> LAPTOP [LAN port] Step 1: Open Cambium controller in the browser. Step 2: After entering in to the site click on the Onboard Device option from Home Tab of Left Panel. Step 3: In the Onboard Option, we will get Claim Device option to adopt a Cambium AP. Step 4: Now we will move to the Cambium AP configuration Part. Below are credentials of default login access of cnpilot E400/E410/E500/E410/E500. IP:192.168.0.1 Command Line Access: Username: admin Telnet: Disabled by default Password: admin SSH: Enabled by default (on standard port: 22) ***We can also use dhcp IP to login to the cnpilot E400/E410/E500. We will get login page. Step 5: We can see several TAB on left panel. On the DashBoard Tab, we will get some overall information. Some are useful for the configuration; some are useful for troubleshoo...
Read more

Error "Unable to retrive Zimbra GPG key for package validation"

-
From the installation log we see: Executing: /tmp/tmp.mSlzRMclVa/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 9BE6ED79 gpg: requesting key 9BE6ED79 from hkp server keyserver.ubuntu.com gpg: keyserver timed out gpg: keyserver receive failed: keyserver error 1. Open port 11371 11371 tcp,udp hkp OpenPGP HTTP Keyserver 2. Force it to use port 80: gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 9BE6ED79 Ref: https://wiki.zimbra.com/wiki/Error_%22Unable_to_retrive_Zimbra_GPG_key_for_package_validation%22
Read more